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<title>
	Javascript Audio Processing
</title>
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<script src="../maxiLib.js"></script>
<!-- <script src="../maxi_webAudio.js"></script> -->

<!-- Our javascript code -->
<script type="text/javascript">
var audio = new maximJs.maxiAudio();
audio.init();

var myCounter = new maximJs.maxiOsc(); //these oscillators will help us count and play sound
var mySwitchableOsc = new maximJs.maxiOsc();//

var CurrentCount;//
var myCurrentEnv;
var myOscOutput,myFilteredOutput = 0.0;//

var myEnvelope = new maximJs.maxiEnv();

var SVF = new maximJs.maxiSVF();
    //Timing is in ms
myEnvelope.setAttack(1.5);
myEnvelope.setDecay(1);  // Needs to be at least 1
myEnvelope.setSustain(1);
myEnvelope.setRelease(200);


SVF.setCutoff(400);
 SVF.setResonance(1);
 

audio.play = function(){
    
    myCurrentEnv=myEnvelope.adsr(1.,myEnvelope.trigger);
    
    CurrentCount=Math.round(myCounter.phasor(1, 1, 9));//phasor can take three arguments; frequency, start value and end value.
    
    // You'll notice that these 'if' statements don't require curly braces "{}".
    // This is because there is only one outcome if the statement is true.
    
    if (CurrentCount==1) myEnvelope.trigger=1; //trigger the envelope
    
    else myEnvelope.trigger=0;//release the envelope to make it fade out only if it's been triggered
    
    myOscOutput=mySwitchableOsc.sawn(50) * mySwitchableOsc.sinewave(1);

        // run output through this filter, and get a mixture of lowpass, bandpass, highpass and notch outputs
     myFilteredOutput = SVF.play(myOscOutput, 0.8, 0, 0.1, myCurrentEnv);

    this.output=myFilteredOutput;
}


</script>

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<body>

	<h1> Filter Example </h1>

	<p>
		
	</p>

    <pre class="prettyprint lang-js linenums:true" id="quine" style="border:4px solid #88c" >
var audio = new maximJs.maxiAudio();
audio.init();

var myCounter = new maximJs.maxiOsc(); //these oscillators will help us count and play sound
var mySwitchableOsc = new maximJs.maxiOsc();//

var CurrentCount;//
var myCurrentVolume;
var myOscOutput,myFilteredOutput;//

var myEnvelope = new maximJs.maxiEnv();
var myFilter = new maximJs.maxiFilter();


    //Timing is in ms
myEnvelope.setAttack(0);
myEnvelope.setDecay(1);  // Needs to be at least 1
myEnvelope.setSustain(1);
myEnvelope.setRelease(1000);


audio.play = function(){
    
    myCurrentVolume=myEnvelope.adsr(1.,myEnvelope.trigger);
    
    CurrentCount=Math.round(myCounter.phasor(1, 1, 9));//phasor can take three arguments; frequency, start value and end value.
    
    // You'll notice that these 'if' statements don't require curly braces "{}".
    // This is because there is only one outcome if the statement is true.
    
    if (CurrentCount==1) myEnvelope.trigger=1; //trigger the envelope
    
    else myEnvelope.trigger=0;//release the envelope to make it fade out only if it's been triggered
    
    myOscOutput=mySwitchableOsc.sawn(100);
    
    // Below, the oscilator signals are being passed through a low pass filter.
    // The middle input is the filter cutoff. It is being controlled by the envelope.
    // Notice that the envelope is being amplified so that it scales between 0 and 1000.
    // The last input is the resonance.
    myFilteredOutput=myFilter.lores(myOscOutput,myCurrentVolume*1000,10);
    
    this.output=myFilteredOutput;//left speaker
}
    </pre>
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